KR100870417B1 - Rubber composition for retreaded tire - Google Patents

Rubber composition for retreaded tire Download PDF

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Publication number
KR100870417B1
KR100870417B1 KR1020070096594A KR20070096594A KR100870417B1 KR 100870417 B1 KR100870417 B1 KR 100870417B1 KR 1020070096594 A KR1020070096594 A KR 1020070096594A KR 20070096594 A KR20070096594 A KR 20070096594A KR 100870417 B1 KR100870417 B1 KR 100870417B1
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KR
South Korea
Prior art keywords
weight
rubber
parts
oil
butadiene rubber
Prior art date
Application number
KR1020070096594A
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Korean (ko)
Inventor
가영현
강창환
김종명
Original Assignee
한국타이어 주식회사
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Priority to KR1020070096594A priority Critical patent/KR100870417B1/en
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Publication of KR100870417B1 publication Critical patent/KR100870417B1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00Compositions of natural rubber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016Compositions of the tread
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/02Elements
    • C08K3/04Carbon
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/04Oxygen-containing compounds
    • C08K5/07Aldehydes; Ketones
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06Copolymers with styrene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00Properties characterising the ingredient of the composition
    • C08L2207/20Recycled plastic
    • C08L2207/24Recycled plastic recycling of old tyres and caoutchouc and addition of caoutchouc particles
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/62Plastics recycling; Rubber recycling

Abstract

A rubber composition for a truck/bus retreaded tire tread is provided to improve abrasion resistance and workability while preventing the degradation of durability by using an oil-extended styrene butadiene rubber which is advantageous for abrasion resistance and a carbon black having proper nitrogen adsorption specific area and a structure. A rubber composition for a retreaded tire tread comprises 100 parts by weight of a base rubber consisting of natural rubber, butadiene rubber and oil-extended styrene butadiene rubber; 58-62 parts by weight of carbon black; 4-6 parts by weight of process oil; and 19-23 parts by weight of acetone extract.

Description

Rubber composition for retreaded tire treads

The present invention relates to a rubber composition for tire treads, and more particularly, to a rubber composition for truck / bus regenerated tire treads, in which a new tread rubber is worn on a worn tire (specifically, a tire case) and regenerated. .

The regenerated tire is a vulcanized contact of a new tread rubber to a tread worn tire, and there are two regeneration methods, hot cure and cold cure.

Here, thermal vulcanization is a method of attaching a new, unvulcanized tread rubber to a worn tire and manufacturing it under vulcanization conditions at a temperature of about 130 ° C. or higher in a mold mold in which the pattern is carved, and cold vulcanization has a pattern shape in the worn tire. The new tread rubber, which has been vulcanized and finished, is produced under low temperature vulcanization conditions of 120 ° C or lower.

Meanwhile, the truck / bus regenerated tire of the present invention is manufactured by applying a thermal vulcanization method, and the tread manufacturing method in the thermal vulcanization method is also extruded using an extruder similar to the manufacture of a new tire, but mainly orbit- Direct extrusion and molding of buffed tires simultaneously using an orbit-tread extruder is the preferred trend in terms of work efficiency.

The most important factors in this orbit-tread extrusion and molding include Mooney Viscosity and Fluidity. It is inevitably required to use.

Examples of the prior art as described above are those disclosed in Japanese Patent No. 6-192480, which have a very high nitrogen adsorption ratio surface area and a broad DBP range with respect to 100 parts by weight of natural rubber, butadiene rubber and styrene butadiene rubber components. Rubber compositions containing 2 to 5 parts by weight of black and alkyl phenolic resins and 7.5 parts by weight or less of acetone extraction are disclosed.

However, since the use of the process oil is limited as the amount of the acetone extract disclosed in the prior art is limited to 7.5 parts by weight or less, a problem that is limited to meet the processability of the orbit-tread molding process in the regenerated tire manufacturing process cannot be overcome. There is a situation. In addition, the alkyl phenol-based resin used in the prior art has a disadvantage in terms of the price of the rubber composition.

The present invention has been made to solve the above problems, and an object thereof is to provide a rubber composition for a truck / bus regenerated tire tread that can improve workability while preventing wear resistance and durability deterioration.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

Truck / bus recycled tire tread rubber composition according to the present invention comprises a raw material rubber made of natural rubber, butadiene rubber and styrene butadiene rubber (Oil extended); 58 to 62 parts by weight of carbon black, 4 to 6 parts by weight of process oil, and 19 to 23 parts by weight of acetone extract, relative to 100 parts by weight of the raw material rubber.

Here, the raw material rubber is composed of 20 to 30 parts by weight of natural rubber, 30 to 40 parts by weight of butadiene rubber and 55 to 65 parts by weight of styrene butadiene rubber containing oil, based on 100 parts by weight of raw rubber, and oil-containing styrene. Butadiene rubber preferably contains 37.5 parts by weight of oil.

In addition, the carbon black preferably has a nitrogen adsorption specific surface area of 118 to 122 m 2 / g, a DBP oil absorption of 124 to 128 cc / 100 g, and a TINT value of 119 to 122.

In addition, the styrene butadiene rubber has a styrene content of 22 to 25% by weight, a vinyl content of 15 to 17% by weight, a number average molecular weight (Mn) of 7.5 to 7.9 × 10 4 , and a weight average molecular weight (Mw) of 3.0 to 3.4 × It is preferred that 10 5 and molecular weight distribution (Mwd) are 3.8 to 4.2.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

The rubber composition for a truck / bus regenerated tire tread according to the present invention as described above provides the following effects.

Increasing the use of the process oil has the advantage of improving the workability and at the same time prevent a decrease in wear resistance and durability.

The rubber composition for truck / bus regenerated tire treads according to the present invention contains raw material rubber and carbon black, process oil and acetone extract for the raw material rubber.

The raw material rubber is made of natural rubber, butadiene rubber and styrene butadiene rubber, natural rubber is included in 20 to 30 parts by weight based on the total raw material rubber to maintain durability.

The butadiene rubber is included in the 30 to 40 parts by weight based on the total raw rubber to improve the wear resistance, it is preferable that the cis-1,4 content of more than 96% and Tg is -104 to -107 ℃ high cis-butadiene rubber.

Here, when the butadiene rubber is included in less than 30 parts by weight, it is difficult to show the effect of improving the wear resistance, and when used in excess of 40 parts by weight may reduce the workability with the increase in butadiene rubber.

In addition, the styrene butadiene rubber is preferably an oil-containing (Oil-Extended) styrene butadiene rubber in consideration of wear resistance, the amount is included in the 55 to 65 parts by weight of the total raw material rubber.

Oil-containing styrene butadiene rubber has a higher molecular weight than non-extended styrene butadiene rubber, which is advantageous for wear resistance.

On the other hand, if the content of styrene butadiene rubber containing oil is less than 55 parts by weight of the total oil content is less workability, and if more than 65 parts by weight of the rubber composition may increase the total oil content of the rubber composition may lower the heat generation performance have.

In addition, the styrene butadiene rubber has an oil content of 37.5 parts by weight, a styrene content of 22 to 25% by weight, a vinyl content of 15 to 17% by weight, a number average molecular weight (Mn) of 7.5 to 7.9 × 10 4 , and a weight average molecular weight ( It is preferable that Mw) is 3.0-3.4 * 10 <5> and molecular weight distribution (Mwd) is 3.8-42. When molecular weight and molecular weight distribution exceed the upper limit, workability becomes difficult, and when it is less than the lower limit, wear resistance may fall.

In addition, the raw material rubber contains 58 to 62 parts by weight of carbon black as a reinforcing agent and 4 to 6 parts by weight of process oil and 19 to 23 parts by weight of acetone extract to improve processability.

Specifically, the carbon black has a nitrogen adsorption specific surface area of 118 to 122 m 2 / g, a DBP oil absorption of 124 to 128 cc / 100 g, and a TINT value of 119 to 122 is preferred. The wear performance is greatly reduced, and if it exceeds 122, the wear resistance is advantageous, but the heat generation is increased, the durability performance is degraded, and the workability is also greatly reduced.TINT value range is also due to the same reasons as the numerical range of the specific surface area adsorption adsorption. May be limited.

If the DBP (DiButyl Phthalate) oil absorption amount is less than 124, heat generation performance is disadvantageous, and if it exceeds 128, it is advantageous in terms of heat generation performance, but processability is lowered.

And, the content of the carbon black having such crystal properties (Colloidal Properties) is limited to 58 to 62 parts by weight, less than 58 parts by weight wear resistance is lowered, more than 62 parts by weight may lower the heat resistance performance.

 The recycled tire is an important factor in the processability of the orbit-tread extrusion process in the manufacturing process bar in the present invention, the process oil is included 4 to 6 parts by weight based on 100 parts by weight of the raw material rubber to improve the processability.

If the process oil is less than 4 parts by weight in content, extrusion processability is lowered. If the process oil is more than 6 parts by weight, wear resistance and heat resistance performance is lowered.

On the other hand, not only the process oil that can be extracted with acetone in the rubber composition, but also an anti-aging agent, processing aid, wax, etc. affects the extrusion processability, so the total acetone extract is also included in 19 to 23 parts by weight based on 100 parts by weight of the raw material rubber, The range of values such as can also be limited for reasons such as the numerical range of process oils affecting extrusion processability.

In addition, conventionally used compounding agents, such as vulcanizing agents, vulcanizing aids, antioxidants, antioxidants, etc. may be appropriately blended in a commonly used amount, the present invention is an alkyl phenol-based resin and antireversion agent (antireversion) agent) can maintain wear and durability performance without including.

Hereinafter, the present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention should not be construed as being limited to the Examples and Comparative Examples.

Table 1 shows the composition of the compound, Comparative Example 1 was changed to styrene butadiene rubber and carbon black, Comparative Example 2 except for changing the styrene butadiene rubber and carbon black and excluding the use of process oil It has the same composition as 1.

Compounding composition (unit: parts by weight) Compounding agent Comparative Example 1 Comparative Example 2 Example Natural rubber 30 30 30 OE-Styrene Butadiene Rubber (1) - - 55 Styrene Butadiene Rubber (2) 55 55 - Butadiene Rubber (3) 30 30 30 Carbon Black (4) - - 60 Carbon Black (5) 60 60 - Zinc oxide 3.5 3.5 3.5 Stearic acid 2.0 2.0 2.0 Process oil 6 0 6 Labor 2.0 2.0 2.0 brimstone 2.0 2.0 2.0 Accelerators (6) 1.5 1.5 1.5 Acetone extract 13.0 7.0 21.0

Corporation

(1): Styrene 22-25%, Vinyl 15-17%, Mn 12.0-14.0 (× 10 5 ), Mw 7.4-7.8 (× 10 5 ), Mwd 5.3 ~ 5.8, OE contains oil (Oil- Extended) and the content is 37.5 parts by weight

(2): Styrene 22-25%, Vinyl 15-17%, Mn 7.5-7.9 (× 10 4 ), Mw 3.0-3.4 (× 10 5 ), Mwd 3.8-4.2

(3): Cis-1,4 content 96% or more, Tg -104 ~ -107 ℃

(4): Nitrogen adsorption specific surface area is 118 ~ 122m 2 / g, DBP oil absorption is 124 ~ 128cc / 100g and TINT value is 119 ~ 122

(5): Nitrogen adsorption specific surface area is 140 ~ 170m 2 / g, DBP oil absorption is 110 ~ 135cc / 100g and TINT value is 125 ~ 140

(6): Sulfenamide N-cyclohexyl-2-benzothiazole sulfenamide (N-Cyclohexyl-2-benzothiazolesulfenamide)

The rubber composition is manufactured in the 315 / 80R22.5 standard by the orbit-tread manufacturing method for thermal vulcanization and is mounted on an actual tractor trailer for evaluation, and the heat resistance is evaluated using an indoor endurance tester, and the result is indexed. The higher the index, the better the performance. In the performance evaluation results, the workability is expressed in terms of pattern viscosity, flowability, and orbit-tread extrudability, and the higher the index, the better the workability.

 Performance evaluation result Performance Comparative Example 1 Comparative Example 2 Example Wear resistance 100 105 103 Heat resistance 100 102 100 Machinability 100 85 120

As shown in the results of Table 2, the wear resistance of the Examples compared to Comparative Examples 1 and 2 is generally the same level, the workability is greatly improved, and the heat resistance is also good overall compared to the Comparative Example.

Through these results, the rubber composition for the truck / bus regenerated tire tread according to the present invention uses oil-extended styrene butadiene rubber and carbon black having a nitrogen adsorption specific surface area and structure that is favorable for wear resistance, and abrasion resistance by optimizing the overall oil content. And it can be seen that while improving the durability while preventing durability degradation.

Claims (4)

  1. Raw rubber comprising natural rubber, butadiene rubber and styrene butadiene rubber with oil;
    58 to 62 parts by weight of carbon black, 4 to 6 parts by weight of process oil, and 19 to 23 parts by weight of acetone extract, based on 100 parts by weight of the raw material rubber,
    The raw material rubber is composed of 20 to 30 parts by weight of natural rubber, 30 to 40 parts by weight of butadiene rubber and 55 to 65 parts by weight of styrene butadiene rubber containing oil, based on 100 parts by weight of raw rubber, and oil containing styrene butadiene rubber The rubber composition for a recycled tire tread, characterized in that it comprises an oil of 37.5 parts by weight.
  2. delete
  3. The method of claim 1,
    The carbon black has a nitrogen adsorption specific surface area of 118 to 122 m 2 / g, DBP oil absorption of 124 to 128 cc / 100g, TINT value of 119 to 122, the rubber composition for retread tire tread.
  4. The method of claim 1,
    The styrene butadiene rubber has a styrene content of 22 to 25% by weight, a vinyl content of 15 to 17% by weight, a number average molecular weight (Mn) of 7.5 to 7.9 × 10 4 , and a weight average molecular weight (Mw) of 3.0 to 3.4 × 10 5 And a molecular weight distribution (Mwd) of 3.8 to 4.2.
KR1020070096594A 2007-09-21 2007-09-21 Rubber composition for retreaded tire KR100870417B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101724378A (en) * 2009-11-26 2010-06-09 盐城工学院 Fly ash resin base friction material
KR101140837B1 (en) 2009-12-23 2012-05-03 한국타이어 주식회사 Tread rubber composition and tire manufactured by using the same
KR101142551B1 (en) * 2009-12-23 2012-05-08 한국타이어 주식회사 Tread rubber composition for retreading bustruck tire and tire retreaded by using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2716626B2 (en) * 1992-06-08 1998-02-18 住友ゴム工業株式会社 Rubber composition for tire tread
KR19980084904A (en) 1997-05-27 1998-12-05 홍건희 Rubber composition for tire tread
KR20050001112A (en) 2003-06-27 2005-01-06 금호타이어 주식회사 Tread compound for High Performance Having All Season Properties
JP2005517067A (en) * 2002-02-07 2005-06-09 ソシエテ ド テクノロジー ミシュラン Tire tread

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2716626B2 (en) * 1992-06-08 1998-02-18 住友ゴム工業株式会社 Rubber composition for tire tread
KR19980084904A (en) 1997-05-27 1998-12-05 홍건희 Rubber composition for tire tread
JP2005517067A (en) * 2002-02-07 2005-06-09 ソシエテ ド テクノロジー ミシュラン Tire tread
KR20050001112A (en) 2003-06-27 2005-01-06 금호타이어 주식회사 Tread compound for High Performance Having All Season Properties

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101724378A (en) * 2009-11-26 2010-06-09 盐城工学院 Fly ash resin base friction material
KR101140837B1 (en) 2009-12-23 2012-05-03 한국타이어 주식회사 Tread rubber composition and tire manufactured by using the same
KR101142551B1 (en) * 2009-12-23 2012-05-08 한국타이어 주식회사 Tread rubber composition for retreading bustruck tire and tire retreaded by using the same

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